I would say most do but some don’t, and with those that do the level of uniform required varies.

My primary school didn’t require uniforms for regular days, though they did have what was called the sports uniform shirt which they preferred kids to wear if away from the school (generally used for sports carnivals with other local schools).

My high school did require uniforms but only really cared about enforcing the uniform shirt and some variety of closed shoe.

The school my youngest sister did years 11-12 at didn’t require uniforms at all, though they probably did care about closed shoes due to safety in science classes etc.